Question : Problem: Mixing SODIMM DDR333 and DDR400

Hi X-perts,

I am upgrading one slot of my notebook memory and it looks as the dealer has only DDR400, while my current set is DDR333.

Are there any problems of combining two slots of DDR333 and DDR400? Obliviously, the bus has 333 Mhz and both chips will run on 333. Should I just take DDR400 or it is better to look for DDR333?

Thanks you

Answer : Problem: Mixing SODIMM DDR333 and DDR400

It is possible that the i855PM chipset on that model may be sensitive to the higher speed modules.   A DDR400 module SHOULD work ... the memory makers claim full downward compatibility ... but laptop memory controllers are more sensitive than desktops => most of the problems I've seen with this have been on laptops (the most common are trying to use older PC133 modules in a PC100 laptop).

So should you "expect any troubles" ?? => No.   But it's certainly best to use a DDR333 module.   As long as your dealer will accept a return, there's no reason not to simply try the DDR400, however => it SHOULD work ... and it's a binary situation (it either works or it doesn't) => you don't have to worry about it working "sometimes" :-)